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51
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Micciulla S, Michalowsky J, Schroer MA, Holm C, von Klitzing R, Smiatek J. Concentration dependent effects of urea binding to poly(N-isopropylacrylamide) brushes: a combined experimental and numerical study. Phys Chem Chem Phys 2016; 18:5324-35. [DOI: 10.1039/c5cp07544k] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The concentration-dependent binding of urea to PNIPAM influences the chain conformation as a result of the subtle interplay between hydration properties and urea repartition around the polymer surface.
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Affiliation(s)
- Samantha Micciulla
- Stranski-Laboratorium
- Institut für Chemie
- Technische Universität Berlin
- D-10623 Berlin
- Germany
| | - Julian Michalowsky
- Institut für Computerphysik
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
| | - Martin A. Schroer
- Deutsches Elektronen-Synchrotron DESY
- D-22607 Hamburg
- Germany
- The Hamburg Centre for Ultrafast Imaging (CUI)
- D-22761 Hamburg
| | - Christian Holm
- Institut für Computerphysik
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
| | - Regine von Klitzing
- Stranski-Laboratorium
- Institut für Chemie
- Technische Universität Berlin
- D-10623 Berlin
- Germany
| | - Jens Smiatek
- Institut für Computerphysik
- Universität Stuttgart
- D-70569 Stuttgart
- Germany
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52
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Song Z, Wang K, Gao C, Wang S, Zhang W. A New Thermo-, pH-, and CO2-Responsive Homopolymer of Poly[N-[2-(diethylamino)ethyl]acrylamide]: Is the Diethylamino Group Underestimated? Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b02458] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Zefeng Song
- Key Laboratory of Functional
Polymer Materials of the Ministry of Education, Collaborative Innovation
Center of Chemical Science and Engineering (Tianjin), Institute of
Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Ke Wang
- Key Laboratory of Functional
Polymer Materials of the Ministry of Education, Collaborative Innovation
Center of Chemical Science and Engineering (Tianjin), Institute of
Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Chengqiang Gao
- Key Laboratory of Functional
Polymer Materials of the Ministry of Education, Collaborative Innovation
Center of Chemical Science and Engineering (Tianjin), Institute of
Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Shuang Wang
- Key Laboratory of Functional
Polymer Materials of the Ministry of Education, Collaborative Innovation
Center of Chemical Science and Engineering (Tianjin), Institute of
Polymer Chemistry, Nankai University, Tianjin 300071, China
| | - Wangqing Zhang
- Key Laboratory of Functional
Polymer Materials of the Ministry of Education, Collaborative Innovation
Center of Chemical Science and Engineering (Tianjin), Institute of
Polymer Chemistry, Nankai University, Tianjin 300071, China
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53
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Wang J, Liu B, Ru G, Bai J, Feng J. Effect of Urea on Phase Transition of Poly(N-isopropylacrylamide) and Poly(N,N-diethylacrylamide) Hydrogels: A Clue for Urea-Induced Denaturation. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01949] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jian Wang
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
- University of
Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Biaolan Liu
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
- University of
Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Geying Ru
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
| | - Jia Bai
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
- University of
Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jiwen Feng
- State
Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,
National Center for Magnetic Resonance in Wuhan, Wuhan Institute of
Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
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54
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Swanson JP, Monteleone LR, Haso F, Costanzo PJ, Liu T, Joy A. A Library of Thermoresponsive, Coacervate-Forming Biodegradable Polyesters. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00585] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- John P. Swanson
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
| | - Leanna R. Monteleone
- Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Fadi Haso
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
| | - Philip J. Costanzo
- Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Tianbo Liu
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
| | - Abraham Joy
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
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55
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Shiraga K, Naito H, Suzuki T, Kondo N, Ogawa Y. Hydration and Hydrogen Bond Network of Water during the Coil-to-Globule Transition in Poly(N-isopropylacrylamide) Aqueous Solution at Cloud Point Temperature. J Phys Chem B 2015; 119:5576-87. [PMID: 25865253 DOI: 10.1021/acs.jpcb.5b01021] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Aqueous solutions of poly(N-isopropylacrylamide), P-NIPAAm, exhibit a noticeable temperature responsive change in molecular conformation at a cloud point temperature (Tcp). As the temperature rises above Tcp, the extended coil-like P-NIPAAm structure changes into a swollen globule-like conformation as hydration levels decrease and hydrophobic interactions increase. Though water plays an important role in this coil-to-globule transition of P-NIPAAm, the behavior of water molecules and the associated hydrogen-bond (HB) network of the surrounding bulk water are still veiled in uncertainty. In this study, we elucidate changes in the hydration state and the dynamical structure of the water HB network of P-NIPAAm aqueous solutions during the coil-to-globule transition by analyzing the complex dielectric constant in the terahertz region (0.25-12 THz), where bulk water reorientations and intermolecular vibrations of water can be selectively probed. The structural properties of the water HB network were examined in terms of the population of the non-HB water molecules (not directly engaged in the HB network or hydrated to P-NIPAAm) and the tetrahedral coordination of the water molecules engaged in the HB network. We found the hydration number below Tcp (≈10) was decreased to approximately 6.5 as temperature increased, in line with previous studies. The HB network of bulk water becomes more structured as the coil-to-globule phase transition takes place, via decreases in non-HB water and reduction in the orderliness of the tetrahedral HB architecture. Together these results indicate that the coil-to-globule transition is associated with a shift to hydrophobic-dominated interactions that drive thermoresponsive structural changes in the surrounding water molecules.
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Affiliation(s)
- Keiichiro Shiraga
- Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hirotaka Naito
- Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Tetsuhito Suzuki
- Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Naoshi Kondo
- Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Yuichi Ogawa
- Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
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